Coolant line pressure decrease
Δp
L
/Δl
Length-based pressure decrease in hPa/m
l
Line length in m
Fig. 4-20:
Coolant line pressure decrease
Use the data of the coolant line manufacturer for calculation.
Fittings pressure decrease
See manufacturer's specification for pressure drop. If no data is available, the
following rough formula can be used:
Δp
L
/Δl
Pressure decrease for tube with same inner diameter in hPa/m
Fig. 4-21:
Fittings pressure decrease
Heat exchanger pressure de‐
crease
See manufacturer's specification for pressure decrease Δp
He
.
Drive components pressure de‐
crease
The resulting pressure decrease Δp
Dc
generally differs from the indicated
Δp
n
, because the flow rate is mostly greater than Q
min
.
Calculating pressure decrease: See chapter "Appendix" → "
" →
"Calculation criteria".
The diagram below shows the relation of pressure decrease and flow rate.
Δp
Pressure decrease
Q
Flow rate
Fig. 4-22:
Flow diagram
Components that are too small can consider‐
ably increase the pressure decrease.
NOTICE
Size the components according to our specifications.
When selecting the coolant pump, its required delivery height ΔH must be
known:
DOK-INDRV*-HXX05******-PR02-EN-P
Bosch Rexroth AG
69/407
Rexroth IndraDrive ML Drive Systems with HMU05
Combining the individual components